USE BERRYMAN B-12 CHEMTOOL FUEL SYSTEM CLEANER FUEL ADDITIVE IN YOUR CAR, TRUCK, MARINE ENGINES, LAWNMOWER, LAWN or GARDEN ENGINES AT A RATE OF 1 OUNCE PER GALLON OF GAS, B-12 CHEMTOOL FROM BERRYMAN IS SAFE FOR USE WITH OXYGEN SENSORS AND CATALYTIC CONVERTERS, FOR CONTINUOUS FUEL SYSTEM MAINTENANCE USE B-12 CHEMTOOL EVERY THIRD TANK FULL.